Speaking from experience here. They have enough time. Most of them are completely politically uninvolved, but the ones who do know about politics are very frequently conservative, so i’m not entirely sure how to go about this.
It would make a lot of sense for rightwingers to mobilize the homeless and it probably won’t be as difficult considering homeless people get a huge amount of aid from churches.
I think there’s potential there, but it’s hard to ask people that can barely sustain their existence to spend time they could be using to earn money is a bit complicated, if there were some true promise of true economical compensation, maybe, but for that you need to expropriate some land which would never happen in the US because their military industry is too big, that generally happens like in countries with heavy levels of peasantry.
Unfortunately, from what i’ve seen, if the venue being seized has a lot of cigarettes, that would also maybe convince some homeless